| Age-related Changes in Anterior, Posterior Corneal Astigmatism in a Korean Population. |
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Yoon Seob Sim, Soon Won Yang, Yu Li Park, Kyung Sun Na, Hyun Seung Kim |
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Department of Ophthalmology and Visual Science, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea. Sara514@catholic.ac.kr |
| 한국인의 각막 전면, 후면난시 축의 분포와 연령에 따른 변화 |
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심윤섭⋅양순원⋅박율리⋅나경선⋅김현승 |
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가톨릭대학교 의과대학 여의도성모병원 안과 및 시과학교실 |
Correspondence:
Hyun Seung Kim,
Email: Sara514@catholic.ac.kr
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Received: 11 May 2017 • Revised: 5 July 2017 • Accepted: 25 July 2017 |
| Abstract |
PURPOSE
To evaluate age-related changes in anterior and posterior corneal astigmatism in Koreans. METHODS: The anterior and posterior corneal astigmatisms of 160 subjects with age ranging from 11 to 92 years, none of whom experienced any complications, were measured with a rotating Scheimpflug camera (Pentacam®). Using this data, the changing proportions of with-the-rule to against-the-rule and changing tendency of anterior and posterior corneal astigmatisms with age were evaluated using polar value analysis according to the Naeser method. RESULTS: For the anterior cornea, the proportion of with-the-rule astigmatisms decreased with age (p < 0.0001). On the other hand, for the posterior cornea, the proportion of against-the-rule astigmatisms decreased with age (p = 0.012). In the polar value analysis, there was a trend toward against-the-rule astigmatism associated with increasing age for the anterior cornea (p < 0.0001) and toward with-the-rule astigmatism for the posterior cornea (p < 0.0001). CONCLUSIONS: In previous studies, the anterior corneal surface shifted from with-the-rule to against-the-rule astigmatism with increasing age, whereas the posterior corneal surface remained as against-the-rule astigmatism in most cases. But, our results showed that the proportion of against-the-rule astigmatisms of the posterior cornea decreased with age. Thus, evaluation of posterior corneal astigmatisms should be performed before cataract surgery in old patients, especially when using a multifocal or toric intraocular lens. |
| Key Words:
Astigmatism;Cataract surgery;Pentacam;Toric intraocular lens |
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